Sludge pump



Jan. 17, 1939, @BSCHNEBLE 2,144,417

` SLUVDGE PUMP Filed Jan. l1, 1937 2 Sheets-Sheet l Jap. 17, -1939. I c. B. scHNElBLE 2,144,417

SLUDGE PUMP n Filed Jan. 11, 1937 2 sheets-sheet 2 fyf Patented Jan. 17, 1939 UNiTfED sTArpEs PATENT oFFlcE 6 Claims.

This invention relates to a sludge pump, and

more particularly to a centrifugal sludge pump equipped with a wear resisting lining. An .object of theinvention is to provide an improved sludge pump which is especially adapted to resist the abrasive action of sand, gravel, etc., and which is well suited to heavy-duty service in pumping liquids having large quantities of sand or other highly abrasive materials.

Another object is to provide a wear resistant lining for a sludge pump which may be replaced in rsections when necessary and which canvbe easily changed in the field without sending the pump in to the factory or shop, Other objects and advantages appear as the specification pro- V ceeds.

A preferred embodiment of the invention is illustrated in the accompanying drawings, in

which- Figi is a sectional view in elevation, the section being taken as indicated at line Vl--I of Fig. 2;A Fig. 2, a broken sectional view in elevation, the section being taken as indicated at line 2-2 ofFig. l; Fig. 3, a plan View of one block of vthe lining; Fig. 4, a sectional view of the block shown in Fig. 3, the section being taken as indicated at the line 44 of Fig, 3; Fig. 5, a plan View. of the vlining block adjacent the discharge opening; Fig. 6, a sectional view of the block shown in Fig. 5, the section being taken as indicated at line 5-6 of Fig. 5; and Fig. 7, a sectional View of a modified form of block for use adjacent the discharge opening.

As illustrated, A designates a pump' casing; B a pump lining, and C an impeller.

The casing 'A may include a cylindrical wall l0 resting on base i3 and having external flanges Hand I2 at its edges. An inlet side piece I4 coextensive with the outer edge ofl flange Il, is

secured to wall l0 by means of bolts l5 extending into ange Il, and has a gasket la adjacent its inner surface. At its centerppiece I4 is formed to provide the inlet pipe I6 which is turned forwardly and adapted to make connection with pipes carrying dirt-laden liquids. Pipe I6 is provided with a wear resistant liner 24 formed of any suitable wear resistant material and which can be replaced when it becomes worn. On the other side of wall l0 is the pressure side piece l! which is coextensive with the outer edge of fiange I2 and is secured to wall I by means of bolts i8 extending into flange l2, the gasket I9 beingplaced adjacent its inner surface.

VPressure piece I1 provides at its center a bearing for one end of shaft 2l. rI'hehollow screw (o1. 10e- 114) l v22 is adapted to receive shaft 2l and screw into piece il to bind the packing material 23 against shaft 2l and in this wayform a tight seal. The

other end of shaft 2l is bearinged in the wall of inlet pipe i6 in a similar manner. 5

Extending rearwardly from the top portion of wall Il is the outlet pipe casing 25, which may be of any suitable form. As illustrated, it includes an outer section 26 of larger diameter and provided with a flange 2l for making connection l0 with the pipes which are to receive the liquid from the pump. The interior of outlet casing is lined with the Wear resisting liner 28 which is of such shape as to t the inner surface of the casing. As shown clearly in Fig. l, liner 28 has l5 a cylindrical bore 23 adjacent the interior of the pump and a frusto-conical bore 23a at its other end, thus providing a Venturi discharge opening, The inner end of liner 28 extends inward beyond wall l0 and has a beveled surface paral- 20 lel With Wall I0.

The pump lining B is comprised of single blocks 3U of a form such as illustrated in Figs. 3 and 4, which blocks are matched up and placed side by side to form a continuous lining as illustrated 25 in Fig. l. The main body 3l of blocks 3E) is arcuate in form, and its sides 32 are cut along radial lines so that the blocks may be placed squarely together to form a cylindrical Wall. At each end of the blocks is an inwardly extended portion 33 which, when the blocks are placed together forms a rim at each side of the'pump. The outer edges of portions 33 are grooved at 34 so that whenY the blocks are placed properly together an annular groove is formed.

Each of blocks 30 is provided with a V-ridge 35 on its exterior surface adjacent wall l0. Ridge 35 extends centrally and lengthwise of the block and has-anarcuate top surface. It is Wider at the top than at the bottom and somewhat resembles the letter V. Y

Corresponding with ridges 35 of blocks 30 are the V-grooves 36 on the interior of wall l0. Grooves 36 are parallel and equally spaced about the circumference of wall I0. They are of the same shape as ridges 35 and are adapted to receive and hold the blocks 3i) by means of ridges 35.

At points adjacent the outlet opening it is necessary to make an opening through the liner blocks also, and in order not to have very small block pieces I prefer to insert here a block 31 of double Width, as illustrated in Figs. 5 and 6 of the drawings. The opening 38 in block 31 is diagonal of the block and is of sufficient size to il fir" receive the inner end of liner 28. When assembled it is seen by Fig. 1 that the inner end of liner 28 is flush with the cylindrical inner surface of blocks 31 and 3G. It will be seen that block 31 has two of the V-ridges 35 and takes up a greater space along wall I0. In Fig. 7 is shown a vsecond form of block which might be used adja- 39 are identical and either block 31 or block 39V may be placed beside blocks 30 to form an even interior lining surface.

Lining blocks 3e, also blocks 31 and 39, may be formed of any suitable material such as rubber, lead, White iron, or special alloys. If desired the blocks which are placed at positions where there is most wear may be made of different material. However, since the blocks are easily replaced it has been satisfactory to form all the blocks of the same material. Y

One of blocks 30 which is at ythe bottom of wall ID is provided with anV opening 40 which connects with drain pipe il leading to the exterior of the pump. Pipe 4l is used only to drain the liquid from the pump and is normally closed to the passage of liquid therethrough.

An annular disk line 4S is placed on the inside of the pump casing and adjacent the inlet side. Its peripheral rim engages the inwardly extended portions 33 of the lining blocks, and its outer edge lll is extended to engage the arcuate grooves 3&3 on each of the blocks. The central opening through disk liner i5 corresponds in size with the interior of inlet pipe l5. Bolts 8 secured in liner i6 extend through piece is and are secured by nuts 8a. Another disk liner 9 is disposed adjacent gasket !8 and has its peripheral rim engaging the extended portions 33 at the other ends of the lining blocks. It also has an extended outer edge portion for engaging the arcuate grooves on this end of the blocks, and has bolts 5) which extend through openings in pressure piece I1 and are secured bynuts 5621,. The central opening 5l in disk liner is is of suiiicient size to admit shaft 2l. Y

The impeller C comprises the shaft El, already mentioned and impeller blades d2 radially secured on opposite sides of shaft 2| by means of clamping irons 133. Irons 133 are secured to shaft 2l by key 44, and blades i2 are secured within clamping irons i3 by screws 45. Y

In the operation of my improved pump, some kind of motive power (not shown) is used to drive the impeller shaft 2l by which the impeller blades i2 are caused to rotate. The centrifugal force of the liquid within the pump causes liquid to be thrown out tangentially through the Venturi discharge passage in liner 28 and causes liquid to be drawn in through inlet pipe I6.

As the dirt-laden liquid passes into the pump through inlet iii the sand and dirt particles are largely in suspension and pass quietly into the pump Without exerting much force against the sides ofthe pipes. But as the liquid cornes into contact with the rapidly rotating impeller, centrifugal force causes the sand and other foreign particles to be driven with force against the pump lining. Though the sides of the pump are subject to some abrasion, the greater share of the abrasive action is against the lining blocks on the interior of the cylindrical wall.

An important feature of my improved pump is that the lining may be easily replaced either wholly or partially as is necessary when it becomes worn. The pump need not be disconnected and carried to a shop or factor, but the blocks may be easily replaced wherever the pump is located and Without disconnecting it. A workman may loosen bolts I8 and remove the pressure plate I1 together with liner disk 49 which is attached to the plate. This leaves the blocks loose at one end and they may be simply pulled axially from wall l0, the ridges 35 sliding in grooves 36, and removed from the pump. New lining blocks may then be inserted in place o the worn ones removed and the pressure plate l1 replaced as it was before. If only half or only a few of the blocks are worn only those that are Worn need to be replaced, and maintenance costs are thereby reduced.

The \!-shaped ridges 35 in the corresponding grooves 35 Vhold the blocks in place and make such replacement of worn blocks possib-le. 'It will be seen that the only'way that the blocks may be loosened is by endwise movement, and when the side plates are in place this movement is prevented. With the side plates in position it may also be seen that the liner disks 46 and 49 engage the end portions of the liner blocks to support these in their correct radial positions.

To remove the discharge liner 28 it is necessary only to remove the discharge casing section 26 and pull the liner from the pump. This liner must be removed whenever it is desired to replace blocks? or 39, whichever may be used, or whenever liner V28 is itself worn and needs to be replaced. The Venturi bore of this liner serves to decrease the pressure of the liquid soon after it enters the discharge opening, and in this Way reduces the abrasive action of leaves the pump.

While I have described a specic form of casing, it is understood that my invention may be used in connection with casings of other forms and which differ greatly from the structure described. It will be obvious that many changes may be made in the form of the parts and the details of construction without departing from the spirit of my invention.

The foregoing detailed description has been given for clearness of understanding only, and no unnecessary limitations should be understood therefrom, but the appended claims should be construed as broadly as permissible in view of the prior art.

What I claim as new and desire to secure by Letters Patent, is:

l. A pump of the character set forth comprising: a casing having inlet andV discharge openings and including Ya cylindrical wall equipped on its inside with spaced axially extending grooves; a pump lining comprising blocks equipped with dovetail ridges, said ridges being iitted into said grooves, one of said blocks having an opening therethrough adjacent said casing discharge opening; and a discharge liner extending through said casing, discharge opening and through said opening in said one of said blocks.

2. A pump of the character set forthcompristhe sand, etc., as it l ing: a casing having inlet and discharge openings and including a cylindrical wall equipped on its inside with spaced axially extending grooves which taper toward their tops; a pump lining comprising blocks -equipped with dovetail ridges, said ridges being i'ltted into said grooves, one of said blocks having an opening therethrough adjacent said casing discharge opening; and a discharge liner having an interior surface in the form of a venturi, said discharge liner extending through said casing discharge opening and through said opening in said one of said blocks.

3. A pump of the character set forth comprising: a casing having inlet and discharge openings and including a cylindrical wall equipped on its inside with spaced axially extending grooves; a pump lining comprising blocks equipped with dovetail ridges, said ridges being fitted into said grooves, said blocks having inwardly extending end portions containing exterior grooves, and a pair of disk liners adjacent opposite sides of the pump and having their edges engaging said inwardly extending end portions of said blocks, said edges extending into said exterior grooves.

4. A pump of the character set forth comprising: a casing having inlet and discharge openings and including a cylindrical wall equipped on its inside with spaced axially extending grooves; a pump lining comprising a number of blocks, each equipped with one dovetail ridge and a larger block equipped with at least two dovetail ridges spaced apart, and being provided with an opening therethrough, said dovetail ridges being disposed in said spaced grooves, and a discharge liner extending through said casing discharge opening and through said opening in said larger block, the inner end of said discharge liner being iiush with the inside surface of said larger block.

5. A pump of the character set forth comprising: a casing having inlet and discharge openings and including a cylindrical wall equipped on its inside with spaced, axially extending grooves, a pump lining comprising blocks equipped with dovetail ridges, said ridges being tted into said grooves, said blocks having inwardly extending end portions, and a pair of disk liners adjacent opposite sides of the pump and having their edges engaging said inwardly extending end portions of said blocks, said edges and said inwardly extending end portions of said blocks having cooperating interlocking portions.

6. A pump of the class set forth comprising: a casing having inlet and discharge openings and including a cylindrical wall equipped on its inside with spaced axially extending recesses, a pump lining comprising a number of blocks, each of said blocks being provided with at least one projection adapted to engage one of said recesses, at least one of said blocks being provided with a discharge opening extending therethrough, a discharge liner extending through said discharge opening, and a pair of disk liners adjacent opposite sides of the pump and engaging the end portions of said blocks.

CLAUDE B. SCI-INEIBLE. 

